Plastic Technologies Inc. (PTI; Holland, OH), a global leader in polyethylene terephthalate (PET) package development, recently published a whitepaper that found post-consumer bottles exposed to ultraviolet (UV) light prior to recycling has a negative impact on the physical properties for the next generation of recycled PET (rPET) bottles.
Intrinsic thickness, yellowing, cloudiness are just some of the traits that provide complications when using rPET along with virgin material. rPET producers have engineered elaborate methods to downplay those traits in order to develop material that provides the desired environmental qualities along with key visual and processing properties.
The bottles used in the study were not tightly packed into large bales. Sunlight could shine through the multiple layers of bottle sidewalls, even reaching the bottles located at the bottom of the open crate.